In some cases, dislike is such a great follow-up to liking someone first.
Why do we like someone and then dislike? Well, I guess as we learn more about these people over time, through more interaction or observation, we kind of form our true feelings about people.
Yet, the most interesting ones are those who I have liked for so long (years/decades) and then suddenly (often accompanied by an unacceptable behaviour) started to dislike/to be irritated.
Where are all the previous positive emotions?? This turn of the heart is the one that I find the most interesting.